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Submission #633197

# Submission time Handle Problem Language Result Execution time Memory
633197 2022-08-21T21:20:11 Z czhang2718 Mecho (IOI09_mecho) C++17
100 / 100
 184 ms 6296 KB 
#include<bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i=a; i<=b; i++)
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define pb push_back
#define f first
#define s second
#define nl '\n'
typedef long long ll;
// #define int ll
typedef vector<int> vi;
typedef pair<int, int> pii;
#define nl '\n'

const int N=800;
int n, s;
string grid[N];
int bee[N][N];
int dist[N][N];
bool block[N][N];
int dx[]={0, 0, 1, -1};
int dy[]={1, -1, 0, 0};

signed main(){
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> s;
    for(int i=0; i<n; i++){
        cin >> grid[i];
    }

    auto check=[&](int t)->bool{
        queue<pair<int,int>> q;
        rep(i,0,n-1) rep(j,0,n-1){
            if(grid[i][j]=='M'){
                if(bee[i][j]<=t) return 0;
                q.push({i,j});
                dist[i][j]=0;
            }
            else dist[i][j]=1e9;
        }
        while(!q.empty()){
            pair<int,int> p=q.front(); q.pop();
            int x=p.first, y=p.second;
            if(grid[x][y]=='D') return 1;
            // cout << x << y << '\n';
            for(int k=0; k<4; k++){
                int nx=x+dx[k];
                int ny=y+dy[k];
                if(nx<0 || nx==n || ny<0 || ny==n || grid[nx][ny]=='T' || dist[nx][ny]!=1e9) continue;
                if(bee[nx][ny]>t+(dist[x][y]+1)/s){
                    dist[nx][ny]=dist[x][y]+1;
                    q.push({nx,ny});
                }
            }
        }
        return 0;
    };

    queue<pair<int,int>> q;
    rep(i,0,n-1) rep(j,0,n-1){
        if(grid[i][j]=='H') q.push({i,j}), bee[i][j]=0;
        else bee[i][j]=1e9;
    }
    while(!q.empty()){
        pair<int,int> p=q.front(); 
        int x=p.first, y=p.second;
        q.pop();
        for(int k=0; k<4; k++){
            int nx=x+dx[k];
            int ny=y+dy[k];
            if(nx<0 || nx==n || ny<0 || ny==n || grid[nx][ny]=='T' || grid[nx][ny]=='D' || bee[nx][ny]!=1e9) continue;
            bee[nx][ny]=bee[x][y]+1;
            q.push({nx,ny});
        }
    }
    // rep(i,0,n-1){
    //     rep(j,0,n-1){
    //         cout << bee[i][j] << " ";
    //     }
    //     cout << nl;
    // }

    int x=0;
    for(int i=20; i>=0; i--){
        if(check(x+(1<<i))) x+=(1<<i);
    }
    cout << (check(x)?x:-1);
    // rep(i,1,1) cout << check(i) << "\n";
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 77 ms 6080 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 740 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 0 ms 468 KB Output is correct
17 Correct 0 ms 468 KB Output is correct
18 Correct 0 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 0 ms 596 KB Output is correct
22 Correct 1 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 0 ms 724 KB Output is correct
26 Correct 1 ms 724 KB Output is correct
27 Correct 1 ms 724 KB Output is correct
28 Correct 1 ms 724 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 724 KB Output is correct
32 Correct 1 ms 724 KB Output is correct
33 Correct 5 ms 2644 KB Output is correct
34 Correct 5 ms 2644 KB Output is correct
35 Correct 19 ms 2680 KB Output is correct
36 Correct 4 ms 3028 KB Output is correct
37 Correct 6 ms 3036 KB Output is correct
38 Correct 27 ms 2932 KB Output is correct
39 Correct 5 ms 3284 KB Output is correct
40 Correct 9 ms 3388 KB Output is correct
41 Correct 30 ms 3396 KB Output is correct
42 Correct 7 ms 3668 KB Output is correct
43 Correct 11 ms 3720 KB Output is correct
44 Correct 38 ms 3708 KB Output is correct
45 Correct 8 ms 4120 KB Output is correct
46 Correct 10 ms 4056 KB Output is correct
47 Correct 61 ms 4112 KB Output is correct
48 Correct 9 ms 4436 KB Output is correct
49 Correct 14 ms 4504 KB Output is correct
50 Correct 57 ms 4436 KB Output is correct
51 Correct 10 ms 4820 KB Output is correct
52 Correct 13 ms 4764 KB Output is correct
53 Correct 74 ms 4872 KB Output is correct
54 Correct 12 ms 5204 KB Output is correct
55 Correct 15 ms 5272 KB Output is correct
56 Correct 79 ms 5240 KB Output is correct
57 Correct 14 ms 5588 KB Output is correct
58 Correct 17 ms 5656 KB Output is correct
59 Correct 92 ms 5644 KB Output is correct
60 Correct 14 ms 6032 KB Output is correct
61 Correct 21 ms 6032 KB Output is correct
62 Correct 112 ms 6024 KB Output is correct
63 Correct 104 ms 6012 KB Output is correct
64 Correct 184 ms 5972 KB Output is correct
65 Correct 170 ms 6028 KB Output is correct
66 Correct 144 ms 6076 KB Output is correct
67 Correct 115 ms 5972 KB Output is correct
68 Correct 52 ms 6056 KB Output is correct
69 Correct 46 ms 5984 KB Output is correct
70 Correct 42 ms 5972 KB Output is correct
71 Correct 40 ms 6000 KB Output is correct
72 Correct 31 ms 5988 KB Output is correct
73 Correct 31 ms 6240 KB Output is correct
74 Correct 54 ms 6228 KB Output is correct
75 Correct 61 ms 6296 KB Output is correct
76 Correct 64 ms 6236 KB Output is correct
77 Correct 58 ms 6296 KB Output is correct
78 Correct 75 ms 6260 KB Output is correct
79 Correct 52 ms 6228 KB Output is correct
80 Correct 62 ms 6268 KB Output is correct
81 Correct 71 ms 6220 KB Output is correct
82 Correct 62 ms 6228 KB Output is correct
83 Correct 72 ms 6232 KB Output is correct
84 Correct 65 ms 6228 KB Output is correct
85 Correct 65 ms 6224 KB Output is correct
86 Correct 71 ms 6228 KB Output is correct
87 Correct 67 ms 6176 KB Output is correct
88 Correct 73 ms 6188 KB Output is correct
89 Correct 73 ms 6180 KB Output is correct
90 Correct 76 ms 6132 KB Output is correct
91 Correct 75 ms 6092 KB Output is correct
92 Correct 73 ms 6120 KB Output is correct